14 APPARATUS 



filtering toxins or in the sterilization of certain media when heating would be 

 unadvisable. 



With the possible exception of the platinum loop, there is no piece 

 of apparatus so applicable to many uses as the capillary pipette made 

 from a piece of glass tubing. 



These may be made in a great variety of shapes. The one with a 

 hooked end, the Wright tube, is the best apparatus for securing blood 



-L-AVERY- 



FIG. 7. i, Apparatus combining various methods for culture of anaerobes; (a) 

 Hofmann clamp for connecting with vacuum pump; (b) pyrogallic at bottom of 

 bottle for Buchner's O absorption method; (c) deep glucose agar stab covered with 

 sterile liquid petrolatum (see anaerobes). 2, One-fourth inch capillary loop U tube 

 for making two nitric acid albumin tests (see chemical examination of urine). 3, 

 Piece of tubing bent to hold slide for steaming smears in flame. 4, Schmidt's fer- 

 mentation apparatus, as modified by using graduated cylinder (see under faeces). 

 5, One-fourth inch glass tubing, 4 1/2 inches long with corks at each end. For 

 contrifuging faeces for ova. 6a, Apparatus connected with sterile centrifuge 

 tube for taking blood from vein of man or a guinea-pig or rabbit's heart. 6b, 

 Erlenmeyer flask which can be used instead of centrifuge tube. See under sections 

 Immunity and Blood. 7, A graduated pipette with Hofmann clamp applied to 

 rubber bulb for precise delivery of measured quantities of liquids. 



for serum tests. The crook hangs on the centrifuge guard and by 

 filing and breaking the thicker part of the tube the serum is accessible 

 to a capillary rubber bulb pipette or to the tip of a haemocytometer 

 pipette. In this way dilutions of serum are easily made. The capil- 



