1896 THE MICROSCOPE. 43 



19. With Acme, No. 4 — (1) Section of Cartilage. (2) Blood Corpuscles, 

 Amphiuma. (3) Section showing structure of Muscle — Dr. G. J. Holmes. 



20. With Bausch & Lomb's Harvard — (1) Section showing Ossification 

 of Cartilage. (2) Blood Corpuscles, AlUigator. (3) Section showing struc- 

 ture of Nerve — Dr. G. J. Holmes. 



21. With Bausch & Lomb's Model— (1) Section of Bone. (2) Blood Cor 

 puscles. Human. (3) Section showing structure of Brain — Dr. G. J. Holmes 



22. With Bausch & Lomb's LTuiversal — (1) Mineral section, Wavellite, 

 with Polarized Light. (2) Japanese Sketch, made of Butterfly Scales. (3) 

 Skin of Sole — A. L. Wiard. 



23. With Zentmayer's Army Hospital — (1) Mineral section, Porphyritic 

 Basalt, with Polarized Light. (2) Section of Chalcedony, with Polarized 

 Light. (3) Young Oysters— M. S. AViard. 



24. With French — (1) Transverse section of stem of Lime. (2) Trans- 

 verse section of Petiole of Pond Lilly. (3) Young Starfish — M.S. Wiard. 



25. With Wales' New Working — Living objects in Water — A. N 

 Lewis. 



26. With Wales' New Working— Living objects in Water— C. M. 

 Burgess. 



EDITORIAL. 



Antony Van Leeuwenhoek and Vivisection. — In a defense 

 of vivisection recently put forth by a committee of scientific 

 men occurs the following narrative: Two hundred years ago 

 there lived at Delft, Holland, this w^ell-to-do Dutchman. He 

 had been a dry-goods clerk in his youth and he had no learn- 

 ing or professional training. He took to making and polishing, 

 for his own use, very small and very strong magnifying glasses, 

 because he was full of scientific curiosity. With them he ex- 

 amined the most miscellaneous objects — among others, })articles 

 from the surface of his teeth and from ditch water. He dis- 

 covered therein living things and described them. He became 

 famous and princes came to look through his little glasses. It 

 was he who first discovered bacteria or microbes. The physi- 

 cians began to guess that disease might be due to the ravages 

 of these forms but as no proof was forth-coming they abandoned 

 the idea for the time. A century later bacteria came to be more 

 studied. The microscope was improved. Chemistr}' had ad- 

 vanced as well as all other means of scientific investigation. 

 The idea that bacteria might cause disease again came to the 

 front and was carried to demonstration by medical men and 



