14 A MANUAL OF BACTERIOLOGY 



buildings, etc., in the grounds of the Institute. 

 Among these are the cages for the accommodation 

 of animals; a special house for the reception of 

 dogs ; stables, etc., for large animals ; a rabbit- 

 house ; a run, etc., for hens ; and an aviary. All 

 these places are kept in a state of perfect cleanliness. 

 This important establishment would not be com- 

 plete without a crematory ; this consists of two large 

 furnaces, situated in one corner of the grounds, whicli 

 are used for destroying all useless animal matter. 



The Pasteur Institute accommodates fifty workers, 

 and is open to foreign as well as French scientific 

 and medical men. Besides being an institute for 

 research, it is also used for the instruction of pupils 

 in both general and special methods of bacterio- 

 logical investigation. 



The above is only a general account of the 

 Pasteur Institute ; but the reader desirous of ob- 

 taining fuller information is referred to the Annales 

 de I'lnstitvt Pasteur, 1889. 



Having given a description of the Edinburgh 

 and the Paris laboratories, we now proceed to 

 describe the various apparatus and appliances used 

 in the study of bacteriology. 



The Microscope. In our experience the best 

 microscopes suitable for the study of 'les infini- 

 -ment petits ' are those made by Carl Zeiss, of Jena 

 (Fig. 3). These instruments are monocular micro- 

 scopes, and consist of the usual parts the stand, 

 eye-pieces, and objectives. Very few workers in 

 bacteriology use the binocular microscope, because 

 there is a great -loss of light, and the definition of 



