The mean result of the best determinations shows that when a current of one ampere is passed for one second, a mass of silver is deposited equal to o **ooi** i 18 gramme.

R is bounded by the basal pinacoid c (**ooi**) parallel to which is the perfect cleavage, the clinopinacoid b ((D10) parallel to the plane of symmetry, and the pyramids m (221) and o (112).

The value of the constant / 7 ranges in different metals from about o **ooI** to 0.04; in soft iron and steel it is said to be generally not far from 0.002.

But the Benedictines, whose settlement in Hungary dates from the establishment of their monastery at Pannonhalma (c. 1 **ooi**), were the chief pioneers.

Acetylene tetrabromide, C 2 H 2 Br 4, which is very conveniently prepared by passing acetylene into cooled bromine, has a density of 3 **ooi** at 6° C. It is highly convenient, since it is colourless, odourless, very stable and easily mobile.

Of factors of the form I + I r n) to the construction of logarithms, and calculated a table of logarithms of factors of the form i +( **ooi**) r n to 24 places.

000007 (6) I (**ooI**)5602 1 (001) 2 598 (7) i (o00)6412 i (**ooi**) 3 780 (8) I (o01)7340 Taking the logarithms from Gray's tables we obtain the required logarithm by addition as follows: In Shortrede's Tables there are tables of logarithms and factors of the form i = (oi) r n to 16 places and of the form i & (.

000007 (6) I (**ooI**)5602 1 (001) 2 598 (7) i (o00)6412 i (**ooi**) 3 780 (8) I (o01)7340 Taking the logarithms from Gray's tables we obtain the required logarithm by addition as follows: In Shortrede's Tables there are tables of logarithms and factors of the form i = (oi) r n to 16 places and of the form i & (.

In size their cells are commonly about o **ooi** mm.

Or Logo I **Ooi**, Log L O 1.002, Log L O 1.003.

Soc., 1882, p. 463) we have the following table for the limits of the magnification numbers, for various microscope objectives, µ = o **ooi** mm.: A=nsinu.

Since 9 2 is less than 4 of 2 734 3 3141 59 0820 29 02 7 34 10 94 0 27231415927 2734 0859 00 0628 32 230 68 219 91 1 35 1 26 (**ooi**) 2, we can obtain three more figures approximately by dividing 2 - (1.414) 2 by 2.818.