950 PHILOSOPHICAL TRANSACTIONS. [anNO IJOb. 



Subjoined to the above history is a short notice of a labouring man, who 

 died after having suffered for a great length of time excruciating pains and 

 spasms in the bowels. On opening the body, the intestines were found com- 

 pacted together by strong adhesions, and their coats thickened and indurated 

 to such a degree, that the cavity or passage was nearly obliterated. 



^n Answer hy Dr. Cockburn, to the Question proposed in a former Number 

 of the Transactions, respecting a Method of proportioning the Doses of Emetics 

 and Purgatives to every Age and Constitution in all Parts of the IVorld. 

 N°303, p. 2119. 



Dr. Cockbum supposes, l.That emetics and purgatives produce no effect 

 till they get into the mass of blood; and 2. That their general effect consists 

 in a change produced in the crasis of the blood and other circulating fluids. 

 From these two postulata he deduces the conclusion, that where the crasis of 

 the blood is the same, the doses of medicines, in order to produce the required 

 effect, must be proportional to the quantity of blood. Thus, for example, if a 

 certain dose be required for altering the crasis of Ibj. of blood to any given 

 degree, a double dose will be required to alter the crasis of Ibij. of blood in the 

 same degree; a triple dose to produce the same alteration in Ibiij. and so on. 

 And universally, if the quantity of blood b require the dose d; the quantity of 

 blood mb will require the dose md ; that is, b : d :: mb : md. To enter into 

 a further detail of this paper VYOuld be no ways instructive, as the postulata 

 from which the conclusions are drawn are by no means admissible. 



An Explanation of the Rule for finding Easter. By the Rev, J. Jachman. 



N° 303, p. 2123. 

 Having met with several explanations of the rule for Easter in our Common 

 Prayer Book, and two published among the Transactions of the Royal Society, 

 but none right and sufficient; and having undoubtedly collected the true sense 

 of the same, by comparing the said rule and the table for Easter in the Common 

 Prayer Book together, I have been persuaded to communicate it to you, in 

 order to be inserted (if you think fit) in the next Philosophical Transactions, 

 as here follows : 



The Rule for finding Easter in the Common Prayer Book, is thus worded, viz 

 Easter-day is always the first Sunday after the first full moon, which happens 

 next after the one-and-twentieth day of March. And if the full moon happens 

 upon a Sunday, Easter-day is the Sunday after. For the right understanding 

 of which, it is sufficient to observe, 1. That the full moon meant is the 14th ^ 

 day of the moon, according to the calendar in the Common Prayer Book, 



