TO CORRESPONDENTS. 



We have to acknowledge the receipt of a Communication from Mr. Gai.braith 

 on Captain Rater's Experiments on the Pendulum: Also of one from Mr. Meikle 

 on the Existence of distinct Calorific Rays in the Sun-beams. — We hope to in- 

 sert in our next a Paper by Mr. Squire on a Compensating Pendulum ; and in 

 the mean time take the liberty of directing his attention to the Observations on 

 the use of Deal for Pendulum-rods, by Mr. Baily, in his paper on Compensation 

 Pendulums, in the Second Part of the Astronomical Society's Transactions lately 

 published. — Mr. Butter's newly-published " Abstract of the Weights' and Mea- 

 sures' Act, with Tables comparing the Old and New Standard," has been re- 

 ceived, and will be noticed in our next. 



A 



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