The Microscope. 



255 



4. Whatever may be the ultimate conclusion of medical 

 men on this question, that still the greatest honor is due to Dr. 

 Koch for having placed at our disposal a method for the diag- 

 nosis of Asiatic cholera. — Medical and Surgical Reporter. 



PATHOGENIC GERMS IN HEALTHY* BLOOD. 



The Paris correspondent of the British Medical Journal 

 tells us that M. Chauveau, at the Grenoble meeting of the Asso- 

 ciation for the Advancement of Science, exposed some facts 

 which warranted the belief that the blood of healthy people 

 contains pathological germs, which only require favorable con- 

 ditions to exhibit their properties. M. Verneuil endorsed this 

 view, and observed that, even when in a condition of appar- 

 ently perfect health, we are, nevertheless, a sort of menagerie, 

 or hot-house, containing a mass of germs, which develop when 

 a wound or injury provides them with the opportunity. M. 

 Oilier instanced recurring osteomyelitis as a proof of the truth 

 of MM. Chauveau and Verneuil's theories. Sometimes, after 

 an interval of ten years, osteo-myelitis re-appears. The microbes 

 remain inert until aroused by a provocative, but the disease 

 re-appears each time in a milder form, suggesting that the 

 micro-organism becomes attenuated by remaining in the human 

 organism. — Medical and Surgical Reporter. 



TABLE OF COLOR-CORRECTIONS. 



Under correction. 



WITHIN FOCUS. 



Brick red. 



Slightly under, but a 

 large number of the 

 finest lenses have this 

 color. 



Nearly colorless — shows 

 the secondary spec- 

 trum. 



Claret. 



Lilac. 



Over-corrected. 



WITHOUT FOCUS. 



Greenish Blue. 



Light Green. 



Paler Green. 



Blue. 



Yellow. 



— Microscopical Bulletin. 



