360 



METHOD OF EXAMINING ASTRONOMICAL INSTRUMENTS J 



grasses were so much grown as to admit good grazing for 



sheep, which were kept thereon for several weeks. It 



should be observed, that the corn is to be mowed while in 



bloom, and when there is an appearance of, or immediately 



after rain, which will be an advantage to the grasses, and 



occasion them to thrive greatly. 



fcnd autumn. I sowed some fields for the same gentleman in autumn 



in the same way, and found them to succeed equally 



well. 



A history of J intended to have made some remarks on some properties, 



plants used m , . , , •%»/-» r « ..,.,. 



agriculture pre- wn,c " nad escaped Mr. Lurtis's notice in his observations, 



panng. anc | which do not add to the celebrity of all the grasses he 



has mentioned; but as I have partly prepared a short his- 

 tory of the nature of all our plants used in agriculture, so 

 far as relates to their properties in a wild state, and the* 

 effect of cultivation upon them, I shall, for the present, 

 defer any farther remarks thereon. 

 I remain, dear Sir, 



Your very obedient servant, 



WILLIAM SALISBURY. 



On a Method of examining the Divisions of astronomical 

 Instruments. By the Rev. William Lax, A. M. F. R. S. 

 Lowndes's Professor of Astronomy in the University of 

 Cambridge. In a Letter to the Rev. Dr. Maskelyne, 

 F. R. S. Astronomer Royal *, 



Dear' Sir, 



St. Ibis, Aug. 27, 180S. 



Importance of A AM persuaded that you must feel, in common with my- 



somemodeof j- ^ unpleasant it is to make use of an instrument in 



ascertaining the > ^ 



accuracy of an astronomical observations requiring extreme accuracy, the 



instrument. exactness of which you have no adequate means of ascer- 



* taining, but are obliged to depend for it in a great mea- 



• Philos. Transact, for 1809, p. 232. 



iur« 



