74 EXERCISE XI 



more visible by adding a drop of methylene-blue solution. Examine 

 similarly a drop from tube (1) and from tube (4) ; in the latter the red 

 corpuscles are laked, in the former they are not laked. 



ANNOTATION 



Obs. 47, 48. Spec. grav. of blood. The the vessels. These reactions can be observed 



method used is that oi Roj {Jnl. of Physiol, with greater completeness by the haemo- 



vol. V, p. ix, 1880). It is employed here globinometer, for instance the Haldane 



to demonstrate (Copeman and Sherrington, haemoglobinometer, but not so rapidly. 



Proc. Physiol. Sac. 1890; Jnl. of Physiol, vol. Obs. 49. For further instructive exercises 



xiv, p. 52, 1893) (a) the rapid recovery of the on haemolysis see G. -N. Stewart's Manual 



circulating blood from dilution after injection of Physiology, pp. 70-3 and pp. 28-32, 7th 



of normal saline by a vein, the injected saline edit. London, 1914. 



being rapidly passed out from the blood Obs. 52. Adrenal extract ; compare with 



into the tissues; (/?) the diminution in the the previous results in exercises I, VI, obs. 22, 



ratio of red blood corpuscles to plasma brought and VII, obs. 32. Pituitary extract, although 



about by haemorrhage, the body making causing vasoconstriction in most organs, 



as it were an effort to restore the dimin- causes dilatation of the renal vessels along 



ished volume of blood in circulation by with diuresis: cf. exerc. X, obs. 44. 



drawing in lymph from the tissues outside Obs. 53. Cf. result in exerc. VI, obs. 24. 



EXERCISE XII 



SALIVAEY SECEETION; AIE EMBOLISM; EXPANSION OF LUNGS BY 



ASPIRATION 



[Square brackets indicate those parts of the exercise which can be omitted at its 



first performance.] 



I. See that the preparation at your table is in good order : it is decere- 

 brate and may not require artificial respiration : at the time of decerebration 

 the r. and 1. carotids v^^ere occluded by ligatures ; the r. artery was released 

 about 5' after decerebration, freeing the circulation in the right submaxillary 

 region. See that it is still free. 



II. Have ready for use, besides the ordinary apparatus as in exerc. IV, 

 the following : 



(1) A thin-walled narrow glass cannula (PI. VI, fig. 3) drawn to fine 

 capillary size for about 15 mm. at one end, and with the hps of this end 

 sloped off on grindstone and smoothed by slight fusion in the flame : this is 

 the cannula for the submaxillary gland duct : see that it is clean and patent 

 throughout. 



