16 On Indian Weights and M*atur*t. [No. 9, netv series. 



will do for the purpose. I have found Ross's Micrometer eye- 

 piece, with the Micrometer removed, answer very well. The most 

 difficult part of the business is to know when you have got the 

 best focus, for the worst image given by the worst Microscope, is 

 sharper and more free from colour, than any I have yet seen upon 

 the screen. A Harney's light moderator improves the picture 

 while focusing, but it stops too much light to be used with ad- 

 vantage. 



I have not kept a record of the times of exposure of the few 

 plates I have had time to take, but I believe the extremes were 15 

 seconds and 2 minutes. I think the collodion I used was very in- 

 sensitive and my Pyrogallic acid was old ; and had probably lost 

 some of its power. 



I believe I have nothing more to add, I do not attempt to teach 

 either Photography or the use of the Microscope, but merely to 

 describe a simple and inexpensive method of adapting the two in- 

 struments, the Camera and Microscope, for use together. 



III. On Indian Weights and Measures. By J. W. Breeks, 

 Esq., C. S. 



Without attempting a formal review of Mr. Bayley's paper 

 on Indian "Weights and Measures, which appeared in No. IV., 

 we desire with a view to encourage discussion and stimulate 

 attention to the subject to say something, in defence of a plan of 

 assimilating Indian to English weights, which plan Mr. Bayley 

 himself has introduced and condemned in the same page. 



So as to arrive collectedly at the point of controversy, we sub- 

 join a brief notice of Mr. Bayley's paper and of his mode of treat- 

 ment. The opening* page states " that no system can be speci- 

 " fled which will not be open to some objections, and the object of 

 1 this paper is simply to propose for the consideration of those 

 (< interested in the matter, a few different modes of arranging the 

 " weights and measures, in order that the subject may be well 



* Madras Journal of Literature and Science, vol. II. No. IV. New 

 Series, p. 183. 



