If we work by logarithms, the operation will not be very troublesome; but the rule needs not be used, unless when a table of the trigonometrical analogies is wanting. To supply which, the foregoing theorems will be found sufficient, and of ready use; being either committed to memory, or noted down on the blank leaf of the trigonometrical tables.
Note, The schemes may be better, raised in card-paper, or with bent wires and threads.
LXXI. An Account of Two extraordinary Cases of Gall-Stones. By James Johnstone, M. D. of Kidderminster. Communicated by the Rev. Charles Lyttelton, L. L. D. Dean of Exeter.
To the Rev. Dr. Lyttelton, Dean of Exeter.
Rev. Sir,
Read Feb. 9, 1758.
ACcording to promise I send you a short account of the two extraordinary cases we talked of, the last time I had the pleasure of seeing you at Kidderminster.
The truth of the first narrated case you are already a sufficient judge of; and if it is at all necessary to ascertain the second in like manner, I can at any time produce the poor woman and her husband before you, who will attest the truth of sufferings, which will not easily escape their memory.
You are at liberty to dispose of this paper as you shall think proper. I am,