Mental Calculation. 315 
veady replies induced his father to make a tour to the principal 
towns: Bristol, Liverpool, Birmingham, Bath, Cambridge, &c. 
&c. where he gave universal satisfaction. In London he ap- 
peared before the Jukes of Kent and‘ Sussex, Lord Stanhope, 
Sir Joseph Banks, and the principal nobility and gentry. Her 
Majesty having signified her commands, he appeared before her 
and the three Princesses at Windsor, and answered the questions 
proposed.to him by the Bishop of Salisbury, without the least 
agitation or hesitation, so quickly and correctly, as highly to 
please Her Majesty, who made him a handsome present. He 
continues to improve in his calculations, and solves very difficult 
questions in a manner to astonish and delight the company. 
He is just now learning to write; figures he cannot make, nor is 
it intended he should be taught yet—Lord Stanhope, who has 
rauch noticed him, advising his friends against it, as fearing it 
may in some measure interfere with that intuitive faculty he at 
present possesses; and certainly the knowledge of figures could 
not make him more ready than he now is. 
The following, among many others, are questions he has cor- 
rectly answered : 
1. Suppose a cistern capable of containing 170 gallons, to 
receive from one cock 54 gallons, and at the same time to lose 
by leakage 30 gallons in one minute; In what time will the said 
cistern be full? 
2. How many drops are there in a pipe of wine, supposing 
each cubic inch to contain 4685 drops, each gallon 231 inches, 
and 126 gallons in a pipe ? 
- 3. How many times will a wheel of 8 feet 3 inches in cir- 
cumference revolve in going 999 miles ? 
4. Suppose the national debt to be 802,032,000/.; If I pay 
147,000/. a day, how long shall I be in paying it off? 
5. What is the square root of 88,115,769 ? 
6. Ifa person is 14 years old, and walks 14 miles each day, 
reckoning 365 days to the year; How many inches has he 
walked ? 
7. If I purchase nine marbles for one halfpenny ; How many 
ean I purchase at the same rate for 10751. 10s. 21d. ? 
8. How many groats are there in 498,265,316 farthings ? 
9. Suppose St. Paul’s was 20 years building, and 500 people 
daily employed, and each consumed 3b. of meat per day; How 
much was consumed in the 20 years? 
10. Suppose a circular reservoir to contain 10,669 hogsheads 
at 6 feet in depth; What will it contain if made 10+ inches 
deeper, and in what time would the whole be full from a spring 
producing | hogshead per minute ? t 
' . if 
