AUTHOR’S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, JULY 12 
A MICROLOGICAL INVESTIGATION OF THE HAIR 
STRUCTURE OF THE MONOTREMATA 
LEON AUGUSTUS HAUSMAN 
Zoological Laboratory, Cornell University 
FOUR PLATES (NINETY-EIGHT FIGURES) AND THREE TEXT FIGURES 
CONTENTS 
Mn GTO CIC HILO sey a.5 ses conis Groin chia) ne Oo Ree OE oe Ee ince aGie < \aguee 463 
Collectionsotairisampless nee; cee ioe fore Go okoe ets 463 
Preparation of hairs for microscopical examination..................... 464 
{Mie Tien OH OP a NOM COLA OOS GHICHOMONSS Osan 6 Bar saueeb noc ascocboc4nodeuoueEoee A72 
SSIRREEI SRY: LOR ITER OT IU ITECIES a cnet sic « auchdya ea tes, Bi say AEE Le ce ial eyn 2s 479 
Shesnansata spines Of HachyglOSSUs LYSLnEL weer. aac ee ae ae - 479 
Summa ys hOEt MACH GlosSuser waa ce Ce ee eee Oe ae aitoee eee 484 
TB ol hveyedets Wo) shidgas secue GR Gace an cer a EMO tear nor ets cord Ce cit caemiced oiciGd o> diel eee 485 
INTRODUCTION 
The observations and conclusions embodied in the present 
contribution are the outgrowth of a comparative study of the 
microscopic structure of the hairs of the monotremes, Ornitho- 
rhynchus anatinus and Tachyglossus hystrix, and incidentally 
and for comparison of members of all of the existing families of 
mammals, except the Cetacea. 
Collection of hair samples 
The majority of the hair samples were collected by the writer 
from skins and mounted specimens in the collections at Cornell 
University and from those in the American Museum of Natural 
History in New York City and in the United States National 
Museum in Washington. Other institutions kindly furnished 
many samples. 
Within each family samples were examined from species rep- 
resenting various types of environments, and from each family 
463 
