If 1^ 1 a-' the liclur "I il l\, :ill<l, in ll.r <>imi>ii c.l I lie 



author.- U ;iii ain]il f.u-tiir lur the ijii.it i.aj"iit\ ihe iotl>n- 



lliiglit e\t 'ml wilhniil ! anger !o ;i ilcplli nl':;..'!!I.S inv. 



In tho OMB of Beam XXV, whieh ta the old itringei uiv.'i 



'o rfii'-iiMit (if s trrnutli, namely, h'il.: 11>- |.. i -i|U,n nidi, t.ikm 



tin- factor of safety, tin 1 cfl'cctivc ilcpth ini^lil 1> iliniinislii >l l>y in 



amount nl I. II I ins. iiii'i rol iiiinht .-af'oly exl -trl 1.1 t'n- 



deptb. 



:n, it will I.,' oli encd tlml tin- .-kin sires- and the c!a-ticii , 

 subject to ;i will- variati'in. Tlii^ variation is ilnc l<> man\ 

 u'-ich lli.' most iin|ii'rl.iiil *K tin' | km.t-. nliliijuily ol' 



:md, more tlrin all, \ in wliirli tin- tiinU'r w.is '.'i-own, jlir 



oiiirinnl |io.-ilinn of ilir ^li<-k in llic lo,ir Iron, whirli it \va> cut, anil iln- 

 |iroportion of haul t" s"ft liln-i-, <>r of Hi Minim r to the spring growth. 

 Tin' Irnsili' sli"ariii'_' airl coni|" i i->- l .\i- eZpertlDei i> upon specimens cut 

 out of ilitl'civiit j art.- of ilic salnc Im.' all >ln\v tl.al tin 1 timber near the 

 (ic.ut pOMettCI iniirli lc-- >trcii'jtli .mil -lillm .-.^ than the timlxT at a 

 'li-tanrr from tlic li ;ir( 



The aci'onipaiiyin^ pln.t.i.nrn|ili i- givc'i to >ho-,v the Variation of 

 BEAM XIII BAM IK 



thickness in the growth ritr.'S from tl.c heart outwanls. -.iiid a car-till 

 tady of the resalfa obtained up to dute would seem to indicate that 

 the host classification defininjr the siivnuth of the timber would be found 

 by dividing the section of a loj; into three parts by means of two circle. , 

 with the heart as the centre, and liy desiirnatinjr the central portion as 

 third i|uality. the portion bvtwocn the two eirolc8 as second quality, 

 and the outermost portion as first i|iialitv. 



A most interesting paper on the structural characteristics of Dou- 

 glas Fir from a botanical stamlpnint was read by Prof s-< r Ponhallow, 

 F.K.S.C., at the meeting of the Royal Society of Canada in Ottawa, 

 in 1894, in connection with a paper by the author on the strength of 

 the timber. 



RED I'lXM. 



Beams XXVI to XXXIII were sent 'o the laboratory 

 McLachlin Bros., of Arnprior. 



These lieams were not specially selected, but were the ordinary scant- 

 lings in the market. They were cut from logs felled in February or 

 March, 1893, in the neighbourhood of the Bonnechere River, Nipissin;: 

 District, County Renfrew. The logs remained in the water from April 

 until October, when they were sent to the mill, where they were sawn 

 up and piled. 



Beam XXVI. This beam was cut from the heart of the tree, and 

 was tested Match 115th, 1894, with the annular ringj, as in Fiir. fili. 



. 



**M. -si - 

 (T~ 



Stg.ss. 



(9 



