ROTCH. — EXPLORATION OF UPPER AIR. 251 



reached a great height ; but in presenting a summary of the results to 

 the French Academy * E. Mascart, the director of the French Meteoro- 

 logical Ollice, remarks that there is reason to hope that this international 

 co-operation will contribute valuable data to our knowledge of the varia- 

 tions of temperature and wind in the upper atmosphere. 



As the American representative of the International Aeronautical 

 Committee, the writer hopes that in this country a similar exploration 

 of the high atmosphere with registration balloons will be attempted, 

 and he is now preparing an estimate of the cost to submit to the trustee 

 of the Hodgkins Fund. Since it should supplement his own researches 

 with kites which are described first in this paper, he has taken the occa- 

 sion to bring the subject of free registration balloons to the attention of 

 the Academy. 



* Comptes Rendus, Vol. CXXIU. No. 22, pp. 918, 961. 



