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diff --git a/Principles_Of_Geotechnical_Engineering/Chapter4.ipynb b/Principles_Of_Geotechnical_Engineering/Chapter4.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:ec42a40195fbc1251bf05efd578442adffe962bc7bf4cd047dc1251517110ed5"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter4-Plasticity and Structure of soil"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg83"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate shrinkage limit of the soil \n",
+      "##initialisation of variables\n",
+      "V1= 24.6 ##cm^3\n",
+      "V2= 15.9 ##cm^3\n",
+      "M1= 44 ##g\n",
+      "M2= 30.1 ##g\n",
+      "W= 1 ##g/cm^3\n",
+      "##calculations\n",
+      "SL= (((M1-M2)/M2)*100)-(((V1-V2)/M2)*W*100.)\n",
+      "##results\n",
+      "print'%s %.1f %s'%('shrinkage limit of the soil = ',SL,' ')\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "shrinkage limit of the soil =  17.3  \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file