564 



SUMMAKY OF GUKKENT RESEARCHES RELATING TO 



ment has been lengthened to 

 carry a complete condenser sys- 

 tem with electric lamp. The 

 illustration (fig. 102) shows the 

 Watson-Conrady Condenser sys- 

 tem in position for use with this 

 camera. 



(.5) Microscopical Optics and 

 Manipulation. 



Orueta, D. Domingo de — Nota 

 sobre la luz ultra-violeta y sus 

 aplicaciones al microscopio. 



[Gives a concise account of the 

 principles, apparatus, and ap- 

 plications of ultra-violet micro- 

 scopy.] 



Madrid (Alcmana), 1912, 

 13 pp. (3 figs.). 



Orueta, D. Domingo de — Apa- 

 rato para observacifin microscdpica 

 (^- directa dibujo y micrografia con luz 



2 monocromatica. 



cj [Gives a full practical account of 



^ the apparatus and methods 



necessary for monochromatic 

 microscopy. Twelve beautiful 

 plates of certain micrographic 

 objects are given in an ap- 

 pendix.] 



Asociacidn Espaiiola para el 

 progrcso de las ciencias 

 {Congreso de Ciranada). 



Madrid [Arias), 1912, 44 pp. 

 (12 pis.). 



i6> Miscellaneous. 



Wright, F. E.— The Methods of 

 Petrographic-microscopic Eesearcb : 

 their Eelative Accuracy and Range 

 of Application. 



Washington, D.C. : Carnegie 

 Institution of Washington, 



1911, 204 pp. (11 pis. and 

 118 figs.). 



See also Nature, Aug. 29, 



1912, p. 678. 



