's head (fig.
E). It is here that new teeth are being constantly formed, and pushed
forward to supply those lost.

[Illustration: Fig. F.--Snail's Tongue (much magnified).]

In this drawing, by the way, you will notice a long arrow (A-B): this
marks the passage which the food takes from the mouth to the gullet, and
thence to the stomach. The head of the arrow points towards the snail's
interior.

In many mollusca, the teeth, instead of resembling one another
throughout the series, are of different kinds, very large and very small
teeth alternating one with another in endless variety.

The horny jaws, to which reference has been made, are generally not
conspicuous; but in the Cuttle-fish and Octopuses they are of huge size,
and have been aptly compared to the beak of a parrot. But we must return
to this subject again on another occasion, for it is one of quite
unusual interest.

AN OLD-FASHIONED GRACE.

This little 'grace before meat' was written two hundred and fifty years
ago by Robert Herrick, a Devonshire clergyman who became a famous poet.
'Paddocks' is an old name for 'frogs,' and 'benison' means blessing;
'heaving up' means 'lifting up in prayer.'

Here a little child I stand,
Heaving up my either hand;
Cold as paddocks though they be,
Here I lift them up to Thee,
For a benison to fall
On our meat and on us all.--Amen.

CURIOUS NAMES IN LONDON CITY.

Time and progress have swept away many of the old streets, lanes, and
alleys for which London City was remarkable. Most of them had names with
a meaning, though it is sometimes difficult to find this out now. One
reason is that, as the years went on, names often got altered in very
odd ways. There were few of what might be called 'fancy' names, such as
are now often given to new streets or roads. Frequently a name arose
from the business of the people who lived in the street, or perhaps it
kept in remembrance some notable person who had a house there.
Occasionally it happened that a lane or alley had several names, and it
is not easy to tell which is the oldest. The citizens sometimes gave two
or three streets the same name.

When it could be done, old names have been kept, or not much altered,
though the street is changed. Old-time Londoners would stare at Cannon
Street of nowadays, so different from the Candle-wick or Candlewright
Street of the past, where lived dealers in tapers and candles. It is
said that Pa