42 BULLETIN OP THE 



(abstract.) 



Like M. Alexander Agassiz,* he had recently tried both the 

 Woodbury process, practised by Mr. Joha Carbutt, No. 1002 

 Arch Street, Philadelphia, and the Albertype method, used by 

 Mr. E. Bierstadt, No. 902 Broadway, New York. Tlie first had 

 reproduced a negative representing an ovule in situ in a mamma- 

 lian ovary magnified 400 diameters, and had furnished an edition 

 of five hundred copies of excellent quality and great uniformity. 

 These prints were cheaper and handsomer, as well as more per- 

 manent, than silver prints, but like them required careful mount- 

 ing on good stiff card-board. Mr. Bierstadt had furnished proofs 

 by his method from a negative repi'esenting a section of mammary 

 cancer, also magnified 400 diameters. These proofs were quite 

 equal to the Woodbury prints, and had the advantage of being 

 on flexible paper suitable for binding. If the edition should turn 

 out to be equal to the proofs, this method would certainly be the 

 more desirable one, and would be a valuable aid to those who 

 wish to obtain trustworthy representations of scientific objects. 

 Dr. Woodward then exhibited the illustrations above referred to. 



Mr. Henry presented a report from Mr. E. J. Earquhar 



ON CERTAIN REMARKABLE EFFECTS OF LIGHTNING, 



Mr. B. F. Craig made some remarks 



ON THERMOMETERS ; 



exhibiting a number of instruments of different kinds. 



20th Meeting, February 5, 18T2. 



The President in the Chair. 

 Mr. J. S. Billings read a. paper 



on some minute fungi, 

 illustrated by numerous drawings and specimens. 



* Application of Photography to- illustrations of Natural History, by 

 Alexander Agassiz. 



