1883.] 



MICROSCOPICAL JOURNAL. 



summer at Montreal, 

 and, we believe, re- 

 ceived universal com- 

 mendation from micro- 

 scopists. 



We also represent 

 the Griffith Club Mi- 

 croscope in its latest 

 and most improved 

 form. In Fig. 2 the 

 stand is shown stand- 

 ing upon its base with 

 a lamp attachment, so 

 that the microscope 

 and lamp can be moved 

 about without changing 

 the illumination. In 

 Fig. 3 the stand is 

 screwed down to the 

 work-table, while the 

 part which constituted 

 the base in the preced- 

 ing figure is now shown 

 converted into a turn 

 table, and a very good 

 turn-table it makes 

 Fig. 4 shows the stand 

 packed in its case 

 Mr. Griffith has ex 

 pended a great deal of 

 ingenuity, time, and 

 money in perfecting 

 this stand, and he now 

 ofifers it as a com.pact 

 microscope for travel- 

 ling, but also as a stand 

 suitable for all pur- 

 poses, to meet all the 

 requirements of the microscopist 

 whatever nature they may be. 



Fig. 4. — Griffith-Club Microscope. 



of 



Natural History of the Oyster. * 



After speaking of the great system 

 in physiology known as the vegetal, 

 the professor took up the ingestion, 

 respiration and circulation of the oys- 

 ter, which he illustrated with the help 

 of the blackboard and diagrams. In 



* Abstract of an Address delivered by 

 Prof. Samuel Lockwood, before the New 

 York Microscopical Society, Dec. 15, 1882. 



regard to the inge stive system, he 

 showed the course which the water 

 took in conveying food to the mouth 

 of the oyster, and described the action 

 of the lips of the oyster in eliminating 

 the food from the water. The posi- 

 tion of the stomach was then shown, 

 with the convoluted intestines, and 

 where the foeces were discharged at 

 a spot where the effete water that had 

 been taken to the mouth returned in 

 a stream, thus carrying the foecal re- 

 fuse out of the shells. Further on he 

 showed the peculiar internal structure 

 of the intestines, by which the great 

 est surface was made available for the 



