96 Transactions of the 



anything more than a very superficial survey, whilst the means 

 provided for enabling the jury to make such an examination were 

 extremely meagre. Suffice it to say that of the objectives exhibited, 

 those of Hartnack, Gundlach, and Nachet were decidedly the best. 

 The immersion objectives of Hartnack performed very well, and his 

 were, on the whole, the best ; those of Gundlach and Nachet were 

 exceedingly good, but not quite so good as those of Hartnack. It 

 should perhaps be mentioned that almost the only te&t submitted 

 was the fine markings of Surirella gemma, and these were cer- 

 tainly very well shown. With regard to the mechanical arrange- 

 ments, the German type of stand generally prevailed, and this is so 

 well understood that it is needless to say much by way of descrip- 

 tion. It appears to be wanting in many appliances which English 

 makers furnish, and which are found very convenient ; but, at the 

 same time, for class instruction its steadiness and simplicity must 

 recommend it to many students. 



