436 PKIZE-QUESTIONS OF SCIENTIFIC SOCIETIES. 



its archives as its property. Authors may always obtain copies at their 

 expense by addressing the permanent secretary. 

 Brussels, session of February 1, 1873. 

 For the class of science, 



AD. QUETELET, 



Permanent Secretary. 



EOYAL ACADEMY OF SCIEi^CE, LITEEATUEE, AND FINE 

 AETS, BEdSSELS, BELGIUM. 



CLASS OF SCIENCE. 



Pmze-questions for 1875. 



FIRST QUESTION. 



Examine <and discuss, in the light of recent experiments, the disturb- 

 ing causes which affect the determination of the electro- motive force 

 and the internal resistance of an element of the electric battery ; give 

 the numerical determination of these two quantities in some of the 

 l)rincipal batteries. 



SECOND QUESTION. 



Give a summary of the facts discovered on the influence of heat upon 

 the development of phanerogamous vegetation, particularly in regard 

 to the periodic phenomena of vegetation, and, for this purpose, discuss 

 the value of the dynamic effect of solar heat on the growth of plants. 



THIRD QUESTION. 



Give the results of new researches in regard to the embryonic de- 

 velopment of Tunicata. 



FOURTH QUESTION. 



State the results of new researches to establish the composition and 

 the mutual relations of the albuminoid substances. 



FIFTH QUESTION. 



Give a description of the coal-measures of the Liege basin. 



The values of the gold medals to be awarded as prizes are 1,000 francs 

 for the fourth and fifth questions, and the former value, 600 francs, for 

 the first, second, and third. 



Authors of the papers inserted in the collections of the academy will 

 be entitled to one hundred copies of their works. They may also ob- 

 tain a larger number by paying the printer for the same at the rate of 

 4 centimes a leaf. 



Manuscripts should be legibly written, composed in Latin, French, 



