adthor's abstract of this paper issued 

 by the bibliographic service, january 16 



THE TEMPERATURE SENSES IN THE FROG'S SKIN 



ANN HAVEN MORGAN 

 Mount Holyoke College, South Hadley, Massachusetts 



ONE FIGURE 



CONTENTS . 



Introduction 83 



Historical 84 



Methods 88 



Observations 89 



1 . Responses to heat 89 



a. Independence of receptors for touch and heat 96 



b. Independence of receptors for pain and heat 100 



c. Independence of receptors for acid and heat 102 



2. Responses to cold 103 



a. Independence of receptors for cold and heat 107 



b. Independence of receptors for touch and cold 107 



c. Independence of receptors for acid and cold 108 



d. Independence of receptors for pain and cold 108 



Discussion Ill 



Summary 112 



Bibliography 113 



INTRODUCTION 



Is a temperature sense present in the frog's skin? Can it be 

 isolated from the chemical and tactile senses which have already 

 been shown to be there? Is it separable into the elementary 

 senses of heat and cold as in the human skin? If so, what is the 

 limitation and the nature of the responses to heat and cold? 



It is in common knowledge that frogs go down into the mud in 

 the winter and come up in the spring and an expectation of March 

 and April that they will be heard on the warm nights. Their 

 thermic susceptibility has long been known, both in nature 

 and in the laboratory. Brown-Sequard ('47) alluded to the 

 possible effect of temperature upon his reflex frogs which Hved 

 longest during the months from June to September, and Kunde 



83 



