' 1'YLORIC GLAND OF THE ASCIDIAX BOTRVLLUS. 37 



by the inte-tine and rectum (Fig. i). In the angle between the 

 two arm- lies a small blind sac, an out-pocket from the pyloric 

 end of the stomach. It- walls are thick and glandular, similar 

 to the walls of the stomach, but the cells that compose it do not 

 contain the -e. retion that gives the -tomach it- characteristic 

 yellow color. 



Thi- ortMii \\a-< ailed by I.ahille '90 the pyloric coecum. It 

 i- into thi- sac, at the point \\here it niter- the -tomach, that the 

 dm t of the p\ l.iric ^l.ind empti- 



1 1 \\ e follow the duct from the p( >int where it enters the pyloric 

 CGBCUm and trace it to the inte-tine we will find it divide iu-t 

 before reaching that or^an. -ending a branch both to the risjit 

 >ide and to the left -idc. At oner on reaching the walls of the 

 inte-iine both branch many time-, finally ending in blind bulbs 

 or ampulla-. Ilo\\c\cr. all the brain he- do not end thus, but a 

 leu not more than ti\e or -i\ pi. Meed half \\a\ to the aim-, 

 often \\ithoiit branehiiu again. The-e tube- do not end in 

 ampulla-. A- ti h the region oi the rectum in -ome cases, 



We U ill for ( oil \ el) iein e It tel to I hell 1 a- I e. tal t llbllle-. 



It i- \ei to -tud\ the oi'van in the li\inv; Hntryllnx and 



indeed it i- |)o--ible in that ua\ to -ee much more than can be 

 ob-ei \ed in the PM served material, either in -ei ti..n- or in -in : 

 \ ieu . When a <"imii- i- ivnio\ed tiom it- -ub-tratuni and 

 p'.u ed on a mil i '< -i oj ,\< -lide, tin- -toinach and inte-tine can be 

 tea-ed out \\itll a ]).iil o| needle- under a di ectin.^ mi( lo-cope. 

 The coiniu- i- then relinked ir.'iii the -lide. a drop of sea \\ a lei- 

 added and the \\h..le d \vith a COVCr glass. The writer 

 foimd .irtilicial li^lit in the -ha|>e of , ( Wei-bach burner, a Xei-- 



apochromatic 2 mm. objective, and compensai 3 \ and 



u . necessities in the pre-.-nt -tud>. 



In tin- li\ in;^ tissue the tube- and bulb- appear highly refractive. 

 In -ome cases it i- quite e.i-\ to see tin- nuclei and e\en the 



chromatin in tin- nuclei. lnnian\ ell boundaries are quite 



clear and the pre-eiu e of cell granule- i- ea-\ to determine. 



The ampulla- are bounded by a rather Mat epithelium, the cell 

 \\all- of which contain often refractive granule- ot a \ellow color. 

 The cell- bear Ion;; \\hip-like Maxell. i. but it i- difficult to deter- 

 mine if all are SO provided. The-e lla^-lla -oon lo-e tlu-ir mo\e- 



