322 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



the superintendence of Voigt. By means of apparatus of his 

 own construction he has been able to measure the amount of 

 perspiration in different portions of the human body. He 

 finds that the most important element in reference to the at- 

 mosphere is its relative humidity, an increase in the relative 

 humidity corresponding to a decided diminution in the quan- 

 tity of perspiration. Of less importance is the influence of the 

 temperature. An increase of temperature acts not so much 

 directly by increasing the capacity of the air for moisture as it 

 does indirectly by first of all bringing about some changes in 

 the skin, increasing the supply of water at the surface whence 

 the evaporation takes place. The ventilation, or the wind, has 

 also a very decided influence, the increase in ventilation cor- 

 responding to an increase in evaporation. There is consider- 

 able interest in his experiments on the influence of clothing 

 upon perspiration, as showing that the clothed arm is subject 

 to variations in the amount of perspiration, which are de- 

 pendent upon the exterior influences of the air, as is the 

 case with the naked arm. Clothing, in fact, does not di- 

 minish, but is rather favorable to the evaporation of water 

 from the surface of the body. 19 C, VIII., 175. 



VERTEBRATES FOUND IN THE DEPOSITS OF THE EOCENE LAKE 



IN NEW MEXICO. 



Professor Cope, in a preliminary report to Lieutenant 

 Wheeler, in charge of the United States Geographical Sur- 

 vey west of the one hundredth meridian, enumerates eighty- 

 three species of the vertebrate animals as having been dis- 

 covered by him in the deposits of the eocene lake that once 

 covered the northern and western parts of New Mexico. 

 Of these eight are fishes, twenty-four reptiles, and fifty-one 

 mammals. Of the whole number, fifty-four species were in- 

 troduced for the first time to the notice of scientists. This 

 fauna is nearly related to that of the eocene of Wyoming in 

 many respects, but differs in the distribution of many of the 

 genera. Thus JPaleosyops a genus, abundant in Wyoming, is 

 not found in New Mexico, while Bathmodon, which does not 

 occur in the Bridger beds of Wyoming, is the most abundant 

 type in New Mexico, parts of over one hundred and fifty in- 

 dividuals belonging to seven species having been found by 

 Professor Cope. Small tapiroid animals of the genus Oro- 



