894 research outputs found
The Progress of Zoology in Iowa During the Last Twenty-Five Years
In endeavoring to estimate the advance in a given science during a definite period of time and in a definite region, it seems evident that the best results can be obtained by ascertaining the work done by the representatives of that science in the region and during the time under consideration, and also the advance made in equipment in the institutions in which that science is taught
The Coral Reefs of Fiji
This is a brief account of the experiences of a zoologist on the reefs of Makuluva, Fiji. The quarters of the party of naturalists from the State University are described, something of daily life touched upon, and the experiences connected with reef collecting are given. Some of the more interesting animal inhabitants of the reefs are described and illustrated
SP-0533: Combined modality treatment: risk-adapted intensified strategies and quality of life
Origin and Significance of Sex
This paper is not presented as a contribution to our knowledge of the subject of the origin of sex, so much as an attempt to express concisely a theory of sex drawn from various sources, but principally from a work on the Evolution of Sex by Geddes & Thomson, a work which seems to me to mark an epoch in the science of philosophical biology
Report of Committee on State Fauna
About two months ago the chairman of this committee sent a circular letter to all the members of the Academy asking for notes that could be used in this report. Up to the time of writing, December 19th, only one member has responded to this request, giving an interesting note concerning one species of animal new to the State, and a note concerning the disappearance of the beaver from Big Creek, Tama County
Report of the Committee on State Fauna
In November last the chairman of this committee sent out a number of postal cards to the zoologists of the Academy, requesting them to forward their notes regarding the appearance of animals new to the state or to certain localities, and any items of interest concerning the geographical distribution of the animals of Iowa. The response was anything but encouraging, as only three members made any answer whatever, and none of these had more than a single note to offer. This will account, in part at least, for the meagerness of this report
The Homology of the Inca Bone
About two years ago, while examining the interesting series of prehistoric skulls in the collection of the Davenport Academy of Sciences, the writer became involved in an attempt to account for the supernumerary bone which someone has marked the “inca” bone. What the significance of the name may be, I do not know, but the significance of the fact is the object of the inquiry involved in this paper
Some of the Causes and Results of Polygamy among the Pinnipedia
Several years ago the writer was much struck by the great sexual differences met with among the Gallinae, and had noted the fact that there was a relation between sexual disparity in size and polygamy
Significance of the Concealed Crests of Fly Catchers
In all the works on animal coloration that have come under my observation, there is a marked absence of any attempt to account for the concealed crests of bright colors on the crown of many birds, notably the Tyrannidae or Fly-Catchers
The Color of Deep-Sea Animals
The purpose of this paper is to explain the phenomena of bright colors among marine animals living in the sea beyond the depths to which sunlight can be supposed to penetrate to such an extent as to render bright colors visible. Although there are doubtless actinic effects of sunlight at considerable depths, we are safe, I think, in saying that colors cannot be clearly distinguished at a depth greater than 100 fathoms. Photographic experiments show that the extreme limit of effect of the sun\u27s rays on sensitive plates is at a depth of 250 metres,” or less than 125 fathoms. As to the facts concerning coloration of deep-sea animals —and the deep sea may be considered from our standpoint as any depth below 100 fathoms—all our information leads to the conclusion that the phenomena of bright colors are present in all groups
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